---
--- Created by 14155.
--- DateTime: 2025/3/29 13:46
---
local voucherId = ARGV[1]
local userId = ARGV[2]
local stockKey = 'seckill:stock:' .. voucherId
local orderKey = 'seckill:order:' .. voucherId

if (tonumber(redis.call('get',stockKey)) <= 0) then
    return 1
end

if (redis.call('sismember', orderKey, userId) == 1) then
    -- 说明是重复下单
    return 2
end

redis.call('incrby', stockKey, -1)
redis.call('sadd',orderKey,userId)
return 0